Mobile Toilet Painting

Mobile toilet painting should adhere to the following standards and process requirements:

1. Painting requirements for steel structural frames
The steel structural frames of mobile toilets (such as square tubes, channel steels, I-beams, etc.) need to be polished first to remove surface rust, oil stains, and burrs, ensuring a flat base material. Then, anti-rust paint should be applied, and three coats must be completed. Each coat should be applied after the previous one has dried to ensure the paint film thickness and anti-corrosion performance. If the wall thickness of the steel is ≥3mm and the thickness of the base channel steel is ≥5mm, special attention should be paid to the treatment of welded joints. The welded parts should be polished flat and then painted with three complete coats of anti-rust paint to avoid corrosion caused by welding defects.
Some high-end mobile toilets use hot-dip galvanized square tubes for welding frames. Such structures need to be sprayed with epoxy anti-rust paint. The hot-dip galvanized layer itself has strong anti-corrosion properties, and the epoxy anti-rust paint can further enhance the protective effect, enabling the mobile toilet to withstand wind speeds of up to 12 levels and earthquakes of magnitude 7 or above. It will not rust or deform under outdoor exposure to sun and rain, with a service life of more than 10 years.

2. Painting process specifications
The painting process should be strictly carried out in three coats. The interval between each coat should be based on the drying of the paint film (usually adjusted according to the ambient temperature to avoid sagging or blistering caused by painting before the previous coat has dried). After painting, a surface inspection should be conducted, focusing on confirming the absence of defects such as missed painting, sagging, and pinholes to ensure uniform coverage of the paint film. If spray painting is used, the spray gun pressure and distance should be controlled to avoid an excessively thick or thin paint mist. If brush painting is used, high-quality brushes should be selected to reduce brush marks.

3. Material selection and matching
The frame materials are mainly galvanized or stainless steel. The former needs to be used with anti-rust paint, while the latter can be directly painted with a topcoat. Surface decorative materials can be matched with aluminum-plastic panels, anti-corrosion wood, etc., which not only enhance aesthetics but also strengthen protection. If higher performance is pursued, stone-like paint process can be adopted: This material is synthesized from natural stone powder and acrylic emulsion. Its thermal conductivity is 70% lower than that of traditional metals, effectively blocking ultraviolet radiation in summer. Its microporous structure can regulate humidity and alleviate the discomfort of users entering a confined space from a high-temperature environment. In addition, stone-like paint has excellent salt and alkali resistance, with a service life extended to more than 8 years in salt and alkali zone anti-corrosion tests. It also has strong self-cleaning properties (a 40% reduction in dust adhesion), and can be kept clean by rainwater flushing during the rainy season, reducing maintenance costs.